package com.dodock.android.banglapapers.imageLoader;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.view.Gravity;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.ProgressBar;

import com.dodock.android.banglapapers.R;

public class ImageLoader {

	FileCache fileCache;
	private Map<ImageView, String> imageViews = Collections
			.synchronizedMap(new WeakHashMap<ImageView, String>());
	ExecutorService executorService;

	Context context;

	public ImageLoader(Context context) {
		this.context = context;
		fileCache = new FileCache(context);
		executorService = Executors.newFixedThreadPool(1);
	}

	int stub_id = R.drawable.logo;

	public void DisplayImage(String url, int loader, ImageView imageView,
			boolean animateFlag, LinearLayout ll) {

		stub_id = loader;
		imageViews.put(imageView, url);
		queuePhoto(url, imageView, ll);
		if (animateFlag && ll != null) {
			addLoadingSpinnerView(ll);
		}
	}

	private void addLoadingSpinnerView(LinearLayout ll) {
		ProgressBar loadingSpinner = new ProgressBar(context);
		loadingSpinner.setIndeterminate(true);

		final Drawable progressDrawable = loadingSpinner
				.getIndeterminateDrawable();

		if (progressDrawable instanceof AnimationDrawable) {
			((AnimationDrawable) progressDrawable).start();

		}
		LayoutParams lp = new LayoutParams(
				progressDrawable.getIntrinsicWidth(),
				progressDrawable.getIntrinsicHeight());

		lp.gravity = Gravity.CENTER;
		ll.removeAllViews();
		ll.addView(loadingSpinner);
	}

	public void queuePhoto(String url, ImageView imageView,LinearLayout l) {
		PhotoToLoad p = new PhotoToLoad(url, imageView, l);
		executorService.submit(new PhotosLoader(p));
	}

	public Bitmap getBitmap(String url) {
		File f = fileCache.getFile(url);
		// from SD cache
		Bitmap b = decodeFile(f);
		if (b != null) {
			return b;
		}
		// from web
		try {
			Bitmap bitmap = null;
			URL imageUrl = new URL(url);
			HttpURLConnection conn = (HttpURLConnection) imageUrl
					.openConnection();
			conn.setConnectTimeout(30000);
			conn.setReadTimeout(30000);
			conn.setInstanceFollowRedirects(true);
			InputStream is = conn.getInputStream();
			OutputStream os = new FileOutputStream(f);
			Utils.CopyStream(is, os);
			os.close();
			bitmap = decodeFile(f);
			return bitmap;
		} catch (Exception ex) {
			ex.printStackTrace();
			return null;
		}
	}

	// decodes image and scales it to reduce memory consumption
	public Bitmap decodeFile(File f) {
		try {
			// decode image size
			BitmapFactory.Options o = new BitmapFactory.Options();
			o.inJustDecodeBounds = true;
			BitmapFactory.decodeStream(new FileInputStream(f), null, o);

			// Find the correct scale value. It should be the power of 2.
			final int REQUIRED_SIZE = 100;
			int width_tmp = o.outWidth, height_tmp = o.outHeight;
			int scale = 1;
			while (true) {
				if (width_tmp / 2 < REQUIRED_SIZE
						|| height_tmp / 2 < REQUIRED_SIZE)
					break;
				width_tmp /= 2;
				height_tmp /= 2;
				scale *= 2;
			}

			// decode with inSampleSize
			BitmapFactory.Options o2 = new BitmapFactory.Options();
			o2.inSampleSize = scale;
			return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}

	// Task for the queue
	public class PhotoToLoad {
		public String url;
		public ImageView imageView;
		public LinearLayout ll;
		
		public PhotoToLoad(String u, ImageView i, LinearLayout l) {
			url = u;
			imageView = i;
			ll = l;
		}
	}

	public class PhotosLoader implements Runnable {
		PhotoToLoad photoToLoad;

		PhotosLoader(PhotoToLoad photoToLoad) {
			this.photoToLoad = photoToLoad;
		}

		public void run() {
			if (imageViewReused(photoToLoad))
				return;
			Bitmap bmp = getBitmap(photoToLoad.url);
			if (imageViewReused(photoToLoad))
				return;
			BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
			Activity a = (Activity) photoToLoad.imageView.getContext();
			a.runOnUiThread(bd);
		}

		public String getUrl() {
			return photoToLoad.url;
		}
	}

	boolean imageViewReused(PhotoToLoad photoToLoad) {
		String tag = imageViews.get(photoToLoad.imageView);
		if (tag == null || !tag.equals(photoToLoad.url))
			return true;
		return false;
	}

	// Used to display bitmap in the UI thread
	class BitmapDisplayer implements Runnable {

		Bitmap bitmap;
		PhotoToLoad photoToLoad;

		public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
			bitmap = b;
			photoToLoad = p;
		}

		public void run() {
			if (imageViewReused(photoToLoad))
				return;
			if (bitmap != null) {
				if(photoToLoad.ll != null){
					photoToLoad.ll.removeAllViews();					
					photoToLoad.imageView.setImageBitmap(bitmap);
					photoToLoad.imageView.setBackgroundColor(Color.TRANSPARENT);
					photoToLoad.ll.addView(photoToLoad.imageView);
				}else{
					photoToLoad.imageView.setImageBitmap(bitmap);
					photoToLoad.imageView.setBackgroundColor(Color.TRANSPARENT);
				}				
			} else {
				photoToLoad.imageView.setImageResource(stub_id);
				photoToLoad.imageView.setBackgroundColor(Color.TRANSPARENT);
			}
		}
	}

	public List<Runnable> stopExecutorService() {
		return executorService.shutdownNow();
	}

}
